<template>
  <footer class="page-edit">
    <div class="edit-link" v-if="editLink">
      <a :href="editLink" target="_blank" rel="noopener noreferrer">{{ editLinkText }}</a>
    </div>
    <div class="last-updated" v-if="lastUpdated">
      <span class="prefix">{{ lastUpdatedText }} : </span>
      <span class="time">{{ lastUpdated }}</span>
    </div>
  </footer>
</template>
<script>
import { isNil } from 'lodash'
import { endingSlashRE, outboundRE } from '@vuepress/theme-default/util/index.js'

export default {
  name: 'PageEdit',
  computed: {
    lastUpdated () {
      return this.$page.lastUpdated
    },
    lastUpdatedText () {
      if (typeof this.$themeLocaleConfig.lastUpdated === 'string') return this.$themeLocaleConfig.lastUpdated
      if (typeof this.$site.themeConfig.lastUpdated === 'string') return this.$site.themeConfig.lastUpdated
      return 'Last Updated'
    },
    editLink () {
      const showEditLink = isNil(this.$page.frontmatter.editLink) ? this.$site.themeConfig.editLinks : this.$page.frontmatter.editLink
      const {
        repo,
        docsDir = '',
        docsBranch = 'master',
        docsRepo = repo
      } = this.$site.themeConfig
      if (showEditLink && docsRepo && this.$page.relativePath) {
        return this.createEditLink(
          repo,
          docsRepo,
          docsDir,
          docsBranch,
          this.$page.relativePath
        )
      }
      return null
    },
    editLinkText () {
      return this.$themeLocaleConfig.editLinkText || this.$site.themeConfig.editLinkText || 'Edit this page'
    }
  },
  methods: {
    createEditLink (repo, docsRepo, docsDir, docsBranch, path) {
      const bitbucket = /bitbucket.org/
      if (bitbucket.test(repo)) {
        const base = outboundRE.test(docsRepo) ? docsRepo : repo
        return (
          base.replace(endingSlashRE, '')
          + `/src`
          + `/${docsBranch}/`
          + (docsDir ? docsDir.replace(endingSlashRE, '') + '/' : '')
          + path
          + `?mode=edit&spa=0&at=${docsBranch}&fileviewer=file-view-default`
        )
      }
      const base = outboundRE.test(docsRepo)
        ? docsRepo
        : `https://github.com/${docsRepo}`
      return (
        base.replace(endingSlashRE, '')
        + `/edit`
        + `/${docsBranch}/`
        + (docsDir ? docsDir.replace(endingSlashRE, '') + '/' : '')
        + path
      )
    }
  }
}
</script>

<style lang="stylus">
@require '../styles/wrapper.styl'
.page-edit
  @extend $wrapper
  padding-top 1rem
  padding-bottom 1rem
  overflow auto
  .edit-link
    user-select none
    display inline-block
    a
      color lighten($textColor, 25%)
      margin-right 0.25rem
      &:hover
        color $accentColor
  .last-updated
    user-select none
    float right
    // font-size 0.9em
    .prefix
      font-weight 500
      color lighten($textColor, 25%)
    .time
      font-weight 400
      color $textInfoColor
@media (max-width: $MQMobile)
  .page-edit
    .edit-link
      margin-bottom 0.5rem
    .last-updated
      font-size 0.8em
      float none
      text-align left
</style>
